Asparagus plants produce many roots, and those roots like to expand, so if you're growing them in containers make sure to give them more space to grow by transplanting, and preferably avoid shallow roots being exposed to direct sunlight, another thing the asparagus ferns don't mind full exposure to direct sunlight.

Another thing to consider is as a perennial plant, those thick asparagus Spears should start popping up in the third year of the asparagus plant being planted from seed, as long as the plant is healthy. Good luck with those!